The Future Perfect Progressive tense in Danish grammar refers to an action that will have been ongoing for a specific period of time in the future. In Danish, this tense is formed by using “vil have været” followed by the present participle of the verb. This tense is used to emphasize the duration or continuous nature of an action that will have been completed at some point in the future. By practicing the use of the Future Perfect Progressive tense, students can gain a better understanding of how to express these types of actions in Danish.